linux-kernel - Re: [PATCH] Uninline kcalloc()

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Date:	Mon, 24 Sep 2007 08:22:31 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Valdis.Kletnieks@...edu
cc:	Alexey Dobriyan <adobriyan@...il.com>, akpm@...l.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Uninline kcalloc()


On Sep 24 2007 01:35, Valdis.Kletnieks@...edu wrote:
>On Sun, 23 Sep 2007 00:03:49 +0400, Alexey Dobriyan said:
>
>> -static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
>> -{
>> -	if (n != 0 && size > ULONG_MAX / n)
>> -		return NULL;
>> -	return __kmalloc(n * size, flags | __GFP_ZERO);
>> -}
>> +void *kcalloc(size_t n, size_t size, gfp_t flags);
>
>NAK.
>
>This busticates some pretty subtle code in mm/slab.c that uses
>uses __builtin_return_address() for debugging - if you do this, then
>the "calling function" gets listed as "kcalloc()" rather than the much more
>useful "function that called kcalloc()" (which is what you care about).
>
>(I remember going around and around multiple times getting those stupid
>inlines set up right, so that feature actually did something useful, otherwise
>kcalloc and kzalloc didn't report where they were called from).

Since 'inline' is only a hint , should not it be __always_inline,
so that __builtin_return_address() always works?

-
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